Most people have probably noticed the use of yellow and blue tape by the Ukrainian army at the beginning of the Russian invasion. This was done to more easily tell the sides apart due to the similarity of uniforms and equipment.
I have started to notice in news reports that ukrainian troops, mostly territorial army, wearing green tape instead which, unless it is meant to represent them specifically, might be be simply due to the scarcity of yellow and blue tape (green is blue + yellow anyway).
At the same time, I have noticed some pro-russian or even russian troops wearing white tape (call back to the White Army of the Russian Revolution ?), here during the Victory Day parade in occupied Melitopol.